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Random convolution ? [message #40093]

Thu, 08 July 2004 07:15

Emmanuel Christophe is currently offline

Emmanuel Christophe
Messages: 11
Registered: March 2004

Junior Member

Hi,

I got a random effect using convolution:

------------------------------------------------------
imagetest=indgen(256,256,224)
ker=indgen(1,3,5)
r1=convol(double(imagetest),double(ker),/edge_truncate)
r2=convol(double(imagetest),double(ker),/edge_truncate)
r3=convol(double(imagetest),double(ker),/edge_truncate)
print, max(abs(r1-r2))
print, max(abs(r1-r3))
print, max(abs(r2-r3))
end
------------------------------------------------------

The first time, I got
IDL> .GO
85.961538
793.00000
768.00000

and the second time:
IDL> .GO
793.00000
793.00000
0.0000000

And all results should be zero... I suspect a memory effect but how ?

Emmanuel Christophe

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